Download or read book The Most Distant Radio Galaxies Probes of Massive Galaxy Formation written by Laura Pentericci and published by . This book was released on 1999 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chasing Hubble s Shadows written by Jeff Kanipe and published by Hill and Wang. This book was released on 2007-01-23 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chasing Hubble's Shadows is an account of the continuing efforts of astronomers to probe the outermost limits of the observable universe. The book derives its title from something the great American astronomer Edwin Hubble once wrote: "Eventually, we reach the dim boundary—the utmost limits of our telescopes. There, we measure shadows, and we search among ghostly errors of measurement for landmarks that are scarcely more substantial." The quest for Hubble's "shadows"—those unimaginably distant, wispy traces of stars and galaxies that formed within the first few hundred million years after the Big Bang—takes us back, in effect, to the beginning of time as we are able to perceive it, when the first discrete stellar objects appeared out of what has lately come to be known as the "cosmic dark age." The information that is being gleaned from these dim sources—chiefly with the aid of Hubble's namesake, the Hubble Space Telescope—promises to yield clues to many cosmic puzzles, including the nature of the mysterious "dark energy" that is now believed to pervade all of space.
Download or read book Toward a New Millennium in Galaxy Morphology written by David L. Block and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt: South Africa - a land of paradigm shifts. A land where we are willing to leave behind the old, to bravely accept the new. What do we need to exit the dark ages in the morphology of galaxies? How prevalent is the cherishing of old concepts? Traditional morphology has been `mask-oriented', focusing on masks of dust and gas which may constitute only 5 percent of the dynamical mass of a galaxy. Some of the world's foremost astronomers flew to South Africa to address morphologically related issues at an International Conference, the proceedings of which are contained in this volume. Examine predicted extinction curves for primordial dust at high redshift. Stars evolve; why not dust? Read about the breakdown of the Hubble sequence at a redshift of one. Explore the morphology of rings; the mysteries of metal-rich globular clusters; vigorous star-formation in the Large Magellanic Cloud; the world of secular evolution, where galaxies change their shapes within one Hubble time. And much more. Examine a new kinematical classification scheme of the unmasked, dust-penetrated near-infrared images of spiral galaxies. This volume contains over 80 refereed contributions (including 18 in-depth keynote review articles), 40 pages of questions and answers, a panel discussion transcribed from tape and 24 colour plates. The volume is unique in that contributions from both high and low redshift experts are represented at a level readily accessible to postdoctoral students entering the exciting world of morphology - whether it be of the local, or more distant, Universe.
Download or read book The Most Distant Radio Galaxies written by and published by . This book was released on 1951 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals of Galaxy Dynamics Formation and Evolution written by Ignacio Ferreras and published by UCL Press. This book was released on 2019-04-02 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Galaxies, along with their underlying dark matter halos, constitute the building blocks of structure in the Universe. Of all fundamental forces, gravity is the dominant one that drives the evolution of structures from small density seeds at early times to the galaxies we see today. The interactions among myriads of stars, or dark matter particles, in a gravitating structure produce a system with fascinating connotations to thermodynamics, with some analogies and some fundamental differences. Ignacio Ferreras presents a concise introduction to extragalactic astrophysics, with emphasis on stellar dynamics, and the growth of density fluctuations in an expanding Universe. Additional chapters are devoted to smaller systems (stellar clusters) and larger ones (galaxy clusters). Fundamentals of Galaxy Dynamics, Formation and Evolution is written for advanced undergraduates and beginning postgraduate students, providing a useful tool to get up to speed in a starting research career. Some of the derivations for the most important results are presented in detail to enable students appreciate the beauty of maths as a tool to understand the workings of galaxies. Each chapter includes a set of problems to help the student advance with the material.
Download or read book From Extrasolar Planets to Cosmology written by Jacqueline Bergeron and published by Springer Science & Business Media. This book was released on 2000-04-14 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: This symposium was dedicated to science opportunities with the VLT. All major areas of astronomical research were discussed in the plenary sessions, ranging from where we stand in cosmology to the new frontiers in the solar system. The workshops published in this volume focussed on different ways of finding clusters of galaxies at high redshift, on gravitational lensing by distant compact clusters, on the use of stellar populations as distance, age or abundance indicators, and on the extraordinary progress made in the discovery of extrasolar planets. This book affords a glimpse of what will be at the center of astrophysical research in the forthcoming decade. It is addressed to researchers and graduate students.
Download or read book The Epoch of Galaxy Formation written by Carlos S. Frenk and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientists in the late twentieth century are not the first to view galaxy formation as a phenomenon worthy of explanation in terms of the known laws of physics. Already in 1754 Kant regarded the problem as essentially solved. In his Univerlal Natural Hutory and Theory 0/ the H eaven$ he wrote; "If in the immesurable space in which all the suns of the Milky Way have formed themselves, we assume a point around which, through some cause or other, the first formation of nature out of chaoo began, there the largest mass and a body of extraordinary attraction will have arisen which has thereby become capable of compelling all the systems in the process of being formed within an enormous sphere around it, to fall towards itself as their centre, and to build up a system around it on the great scale . . . . Observation puts this conjecture almost beyond doubt. " More than 200 years later, a similar note of confidence was voiced by Zel'dovicb at an IAU symposium held in Tallin in 1911; "Extrapolating . . . to the next symposium somewhere in the early eighties one can be pretty sure that the question of the formation of galaxies and clusters will be solved in the next few years. " Perhaps few astronomers today would share Kant's near certainty or feel that Zel'dovich's prophecy has been fulfilled, Many, however, will sympathize with the optimistic olltlook of these two statements.
Download or read book Galaxy Interactions at Low and High Redshift written by J.E. Barnes and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings offer professional astronomers an overview of the rapidly advancing subject of galaxy interactions at low and high redshifts. The symposium gave participants an exciting glimpse of a developing synthesis highlighting galactic encounters and their role in the history of the Universe.
Download or read book Revealing the Heart of the Galaxy written by Robert H. Sanders and published by Cambridge University Press. This book was released on 2013-11-25 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written in an informal and engaging style, this volume traces the discoveries that led to our understanding of the size and structure of the Milky Way, and the conclusive evidence for a massive black hole at its center. Robert H. Sanders, an astronomer who witnessed many of these developments, describes how we parted the veil of interstellar dust to probe the strange phenomena within. We now know that the most luminous objects in the Universe - quasars and radio galaxies - are powered by massive black holes at their hearts. But how did black holes emerge from being a mathematical peculiarity, a theoretical consequence of Einstein's theory of gravity, to become part of the modern paradigm that explains active galactic nuclei and galaxy evolution in normal galaxies such as the Milky Way? This story, aimed at non-specialist readers and students and historians of astronomy, will both inform and entertain.
Download or read book Galaxy Formation and Evolution written by Houjun Mo and published by Cambridge University Press. This book was released on 2010-05-20 with total page 841 pages. Available in PDF, EPUB and Kindle. Book excerpt: A coherent introduction for researchers in astronomy, particle physics, and cosmology on the formation and evolution of galaxies.
Download or read book Texas In Tuscany Proceedings Of The Xxi Symposium On Relativistic Astrophysics written by Bandiera Rino and published by World Scientific. This book was released on 2003-09-17 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: This invaluable proceedings contains contributions from leading scientists in astrophysics, cosmology and related fields such as gravitation and elementary particles physics. It provides a general review of the status and the prospects of research in these fields for an audience of astrophysicists and physicists. The book includes both in depth reviews of various fields of relativistic astrophysics and shorter contributions on the latest results and developments in more specific areas. Some of the topics discussed are: physics of the early universe, cosmological parameters, formation of galaxies, black holes and compact objects, gravitational waves, cosmic rays, high energy radiation, dark matter, cosmic background, active galactic nuclei, supernovae and gravitational lensing.The proceedings have been selected for coverage in:• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)
Download or read book Introduction to Galaxy Formation and Evolution written by Andrea Cimatti and published by Cambridge University Press. This book was released on 2019-10-17 with total page 587 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive examination of nearly fourteen billion years of galaxy formation and evolution, from primordial gas to present-day galaxies.
Download or read book Extragalactic Radio Sources written by R. Ekers and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: On the 100th anniversary of Marconi's successful experiment on radio broadcasting, 250 astronomers from all over the world met in Bologna (Italy) for five days, to update their knowledge of the physics and statistical properties of powerful extragalactic radio sources. Since their discovery in the fifties enormous progress has been made. The existence of superluminal motions in the cores of radio sources, the presence there of a black hole surrounded by an absorbing dust torus, as inferred mostly from studies at other wavelengths, are now accepted ideas. Nevertheless, in spite of these efforts, there are many questions still unanswered. For instance we do not know which mechanism produces the huge amount of energy supplied to radio sources, how the jets connecting the `engine' to the lobes are formed and collimated, which of the differences observed among the various classes of radio sources are apparent and which are real. These and other related topics are discussed in this book.
Download or read book Galaxy Formation and Evolution written by Hyron Spinrad and published by Springer Science & Business Media. This book was released on 2006-08-29 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Astronomical Life – Observing the Depths of the Universe” Though science as a subject can be di?cult, what has been more important for me is that its practice can also be rewarding fun! This book is crafted to expose the reader to the excitement of modern observational cosmology through the study of galaxy evolution over space and cosmic time. Recent extragalactic research has led to many rapid advances in the ?eld. Even a suitable skeptic of certain pronouncements about the age and structure of the Universe should be pleased with the large steps that have been taken in furthering our understanding of the Universe since the early 1990’s. My personal involvement in galaxy research goes back to the 1960’s. At that point, galaxies were easily recognized and partially understood as organized c- lections of stars and gas. What their masses were presented a problem, which I supposed would just fade away. But fade it didn’t. Distant active nuclei and quasars were discovered in the mid-1960’s. A c- mon view of QSOs was that they have large redshifts, but what use are they for cosmology or normal galaxy astrophysics? I shared that conclusion. My expec- tions fell below their potential utility. In short, the Universe of our expectations rarely matches the Universe as it is discovered.
Download or read book The Sixth Canadian Conference on General Relativity and Relativistic Astrophysics written by Stephen Paul Braham and published by American Mathematical Soc.. This book was released on 1997 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is the refereed proceedings of the Sixth Canadian Conference on General Relativity and Relativistic Astrophysics held in May 1995 at the University of New Brunswick. The book includes invited talks and contributed talks and posters including state-of-the-art reviews of many of the most recent important developments in gravitational physics. This book would serve as a good supplement to standard texts on the topic. It features: review articles in key areas - black holes, numerical relativity, etc.; contributions covering most of gravitational physics; useful articles for students who wish to begin exploring the issues discussed; and, invited talks given by researchers known for their ability to communicate their expertise.
Download or read book New Worlds New Horizons in Astronomy and Astrophysics written by National Research Council and published by National Academies Press. This book was released on 2011-02-04 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Driven by discoveries, and enabled by leaps in technology and imagination, our understanding of the universe has changed dramatically during the course of the last few decades. The fields of astronomy and astrophysics are making new connections to physics, chemistry, biology, and computer science. Based on a broad and comprehensive survey of scientific opportunities, infrastructure, and organization in a national and international context, New Worlds, New Horizons in Astronomy and Astrophysics outlines a plan for ground- and space- based astronomy and astrophysics for the decade of the 2010's. Realizing these scientific opportunities is contingent upon maintaining and strengthening the foundations of the research enterprise including technological development, theory, computation and data handling, laboratory experiments, and human resources. New Worlds, New Horizons in Astronomy and Astrophysics proposes enhancing innovative but moderate-cost programs in space and on the ground that will enable the community to respond rapidly and flexibly to new scientific discoveries. The book recommends beginning construction on survey telescopes in space and on the ground to investigate the nature of dark energy, as well as the next generation of large ground-based giant optical telescopes and a new class of space-based gravitational observatory to observe the merging of distant black holes and precisely test theories of gravity. New Worlds, New Horizons in Astronomy and Astrophysics recommends a balanced and executable program that will support research surrounding the most profound questions about the cosmos. The discoveries ahead will facilitate the search for habitable planets, shed light on dark energy and dark matter, and aid our understanding of the history of the universe and how the earliest stars and galaxies formed. The book is a useful resource for agencies supporting the field of astronomy and astrophysics, the Congressional committees with jurisdiction over those agencies, the scientific community, and the public.
Download or read book Gamma ray Bursts as Probes of the High redshift Universe written by Jean-Baptiste Vielfaure and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les sursauts-gamma (GRBs) sont parmi les événements cosmiques les plus brillants. Ces flashs de photons gamma de courte durée sont suivis d'une rémanence brillante observable des rayons X aux ondes radio. La classe des sursauts-gamma longs (LGRBs) est associée à la mort d'étoiles massives. Les LGRBs se produisent généralement dans des galaxies peu brillantes avec des taux de formation stellaire spécifiques élevés et des environnements à métallicité inférieure à la métallicité solaire. Leurs hôtes pourraient être représentatifs de la population de galaxies présente à l'époque de la réionisation, encore mal connue. L'utilisation des LGRBs comme sondes des galaxies dans l'Univers distant offre des avantages uniques : (i) le flash de photons gamma nous permet de détecter des galaxies à tous décalages spectraux indépendamment de leurs propriétés d'émission; (ii) grâce à leur forte luminosité, les LGRBs peuvent être utilisés comme des phares capables de révéler le milieu interstellaire (MIS) des galaxies même les plus faibles et les plus éloignées, en apportant des détails inaccessibles autrement; (iii) la rémanence des LGRBs s'estompe rapidement, permettant l'étude des galaxies hôtes. Le but de cette thèse est d'utiliser les LGRBs pour étudier certaines des propriétés des galaxies à formation d'étoiles, distantes et faibles. Pour cela, je combine les informations sur le MIS obtenues par les raies d'absorption présentes dans les spectres de rémanence à celles du gaz ionisé obtenues par les raies d'émission de la galaxie hôte. De plus, j'approfondis l'interprétation des données à l'aide de simulations numériques.La première partie de cette thèse montre que les LGRBs sont des outils puissants pour détecter l'échappement de photons ionisants de galaxies très faibles et caractériser les voies par lesquelles cela se produit.Je présente les résultats de l'observation d'émission LyC dans le spectre de rémanence d'un LGRB nouvellement découvert. Cette détection est complétée par les observations de deux autres galaxies hôtes de LGRBs pour lesquelles un échappement de LyC est connu, afin de déterminer leur fraction d'échappement en LyC et de comparer leurs propriétés. Les fractions d'échappement calculées le long de la ligne de visée du LGRB sont élevées, et augmentent le nombre de détections des émetteurs LyC, en particulier à des magnitudes absolues très faibles.La deuxième partie de mon travail est consacrée à l'étude de la population des galaxies hôtes de LGRB étant émetteurs Lyman-alpha (LAE). Je mets à jour le recensement de ces galaxies en fournissant une compilation de toutes les détections disponibles, et en déterminant les statistiques de LAEs à partir d'échantillons spectroscopiques de galaxies hôtes de LGRB et de rémanences.A partir de cette étude, je sélectionne un sous-échantillon de quatre galaxies pour lesquelles on peut mesurer les principaux paramètres nécessaires pour contraindre le modèle de coquille utilisé pour interpréter la raie d'émission Lyman-alpha.Le modèle donne des résultats inconsistants pour les LGRB-LAEs qui présentent les densités de colonne d'hydrogène neutre les plus élevées, pourtant typiques des hôtes de LGRB et des LGRB-LAEs.Ce résultat amène à une interprétation des informations sondées le long de la ligne de visée des LGRBs et de l'échappement des photons Lya. Enfin, ces résultats sont approfondis à travers la simulation numérique d'une galaxie à z=3 ayant des propriétés typiques des galaxies hôtes de LGRB. Je trouve que les photons Lyman-alpha s'échappent de plusieurs régions au sein de la galaxie plutôt que d'une seule région dominante jeune et active qui pourrait héberger le LGRB. Cette thèse montre que les observations de la rémanence des LGRBs et de leur galaxie hôte sont des outils puissants permettant d'explorer les propriétés des galaxies faibles et distantes.
